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M type lathe tumbler reverse

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David George 120/03/2019 09:47:38
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718 forum posts
257 photos

I acquired some castings for tumbler reverse so started machining first casting.

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Held in 3 jaw chuck skimmed machining boss and centred to hold square and machined outside to size.

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Skimmed inside face to help hold whilst cutting radial slot etc.

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Turned round to face boss to length and bore to size for spindle.

David

Hopper20/03/2019 09:50:24
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3391 forum posts
65 photos

Good work for an 80-year-old "hobby" machine. thumbs up

geoff walker 120/03/2019 11:12:44
276 forum posts
117 photos

Excellent work, nice castings!!!!!

Geoff

David George 123/03/2019 06:47:14
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718 forum posts
257 photos

Next set up on rotary table for milling.

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David

David George 123/03/2019 09:33:31
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718 forum posts
257 photos

Finished machining radial work on main casting.

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David

Michael Gilligan23/03/2019 13:26:56
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12768 forum posts
553 photos

That's looking good, David yes

This thread should make a useful 'masterclass' reference for some tricky-looking jobs.

MichaelG.

David George 123/03/2019 17:41:57
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718 forum posts
257 photos

Now to turn the boss to length. Hacksawed the boss waste off and made a expanding shaft jig to hold the part. Piece of size material, centre drill with large drill to make 60 deg cone and tap M8 for screw. Turn 60 deg on back of head on cap screw. Hacksaw two slits to allow diameter to expand. Debur and screw in screw check amount of expansion, loosen and put on part tighten to grip part and check that it won't slip, OK.

 

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Put in lathe chuck turn to length and the main casting bar drilling for pin on assembly us done.

 

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David

 

Edited By David George 1 on 23/03/2019 17:43:39

David George 126/03/2019 21:15:04
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718 forum posts
257 photos

Started work on quadrant casting.

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Fly cut the casting to thickness and then clamp down to bore the holes for gears.

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Finally bore the shaft hole for support shaft.

David

David George 127/03/2019 13:55:02
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718 forum posts
257 photos

Started to drill the quadrant casting edge holes. As the hole for the location plunger has to be at 112.5 degrees to gear holes I used a sine bar to set the angle. The hole has to be in relationship to shaft hole so bolted a short length of shaft to angle plate and centred mill on shaft. Put casting on to shaft, rotated to suit the sine bar and clamped problem solved.

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David

geoff walker 127/03/2019 19:38:34
276 forum posts
117 photos

Nice work David,

I admire your methods and attention to detail.

I suspect this will be the most accurate T.R. ever made!!!

atb Geoff

Howard Lewis27/03/2019 21:50:02
1810 forum posts
2 photos

Looking good! Very well done!

Howard

David George 103/04/2019 08:02:09
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718 forum posts
257 photos

Done a bit more on tumbler reverse, made the turned parts and started drilling and milling them to get them to work and the small gears have arrived so I can try to fit it and set it up for drilling for taper pin to fix it rotationally. I drilled and tapped the main casting for a grub screw to help with holding it whilst setting it up.

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David

Nicholas Farr03/04/2019 08:47:42
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1766 forum posts
879 photos

Hi David, really is looking a very nice job.

Regards Nick.

Brian H03/04/2019 10:09:07
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1047 forum posts
83 photos

Thanks for sharing that David, I'm sure it will help one or two of us the consider what looks at first sight, rather tricky jobs and your workmanship is excellent.

Brian

David George 103/04/2019 19:51:54
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718 forum posts
257 photos

Made a new top cover for gear casing.

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David

 

Edited By David George 1 on 03/04/2019 19:53:10

David George 104/04/2019 12:58:39
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718 forum posts
257 photos

Pinned the casting to the shaft.

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David

geoff walker 104/04/2019 16:05:05
276 forum posts
117 photos

Looks finished now David, except for the painting.

Assume the gears are ok, whole job very professional.

I used the grub screw method to hold it together while fitting the taper pin, GMTA?

Completed mine about 9 years ago, same patterns used for the castings as yours.

Here is an archive picture.

001.jpg

Geoff

David George 106/04/2019 15:42:59
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718 forum posts
257 photos

Finished and painted Tumbler reverse. It works very well but need to play around with gearing for fine feed.

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David

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